Collection (old-style) in Plone 5

Hello, I am in process of migration of Plone 4 to plone 5.2
Wanted to use Collection (old-style) in Plone 5.2 with python 3.7

I am able to use Collection (new-style) but I am not able to activate Old-Style Collection.

Now sure how to proceed with it, I would really appreciate if someone has more insights into it.

Thanks in advance.

"old-style" stuff like Archetypes or Archetypes-based functionality is no longer available on Plone 5.2/Python 3...move to "new-style" collections which are available for years now.

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Thank you for the response. Yes, I have started using "new-style" collections